Light energy from the sun is captured by photosynthesis as ____
a. heat energy in chemical bonds
b. energy in chemical bonds
c. chemical energy lost to the environment
d. kinetic energy in chemical bonds
e. conserved energy
ANSWER: b
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Which glial cell(s) is/are only found in the peripheral nervous system?
a. Schwann cells b. oligodendrocytes c. astrocytes d. microglia e. saltatory cells
Which of the following carries amino acids to ribosomes, where amino acids are linked into the
primary structure of a polypeptide? a. mRNA b. tRNA c. hnRNA d. rRNA e. tDNA
Chromosome-level gene repression involves
A) supercoiling. B) physical blockage of gene regions. C) chromatin formation. D) nucleosomes. E) All of these
About __________ of the total energy the sun releases strikes the atmosphere
a. one-tenth b. one-hundredth c. one-thousandth d. one-millionth e. one-billionth